Page 1
1-3. SPECIFICATIONS
Model Power supply *1 Wire specifications *2
Pipe size
(thickness *3, *4)
Indoor unit Outdoor unit Rated Voltage Frequency
Breaker
capacity
Power supply
Indoor/outdoor
connecting wire
Gas / Liquid
MS-GF20VA
MS-GF25VA
MS-GF35VA
MU-GF20VA
MU-GF25VA
MU-GF35VA
230 V 50 Hz 10 A
3-core
2.5 mm
2
4-core
1.0 mm
2
ø9.52 / 6.35 mm
(0.8 mm)
(GF20, 25/GF35)
Pipe length and height difference
Max. pipe length 20/25 m
Max. height difference 10 m
Max. number of bends *5, *6 10
Refrigerant adjustment A *7 20 g/m
Insulation thickness *8, *9
8 mm
1. BEFORE INSTALLATION
1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
• Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing the air conditioner.
• Be sure to observe the warnings and cautions specified here as they include important items related to safety.
• After reading this manual, be sure to keep it together with the OPERATING INSTRUCTIONS for future reference.
CAUTION
(Could lead to serious injury in particular environments when operated incorrectly.)
WARNING
(Could lead to death, serious injury, etc.)
N Do not install the unit by yourself (user).
Incomplete installation could cause fire, electric shock, injury
due to the unit falling, or leakage of water. Consult the dealer
from whom you purchased the unit or a qualified installer.
N Perform the installation securely referring to the installa-
tion manual.
Incomplete installation could cause fire, electric shock, injury
due to the unit falling, or leakage of water.
N When installing the unit, use appropriate protective equip-
ment and tools for safety.
Failure to do so could cause injury.
N Install the unit securely in a place which can bear the
weight of the unit.
If the installation location cannot bear the weight of the unit,
the unit could fall causing injury.
N Electrical work should be performed by a qualified, expe-
rienced electrician, according to the installation manual.
Be sure to use an exclusive circuit. Do not connect other
electrical appliances to the circuit.
If the capacity of the power circuit is insufficient or there is
incomplete electrical work, it could result in a fire or an electric
shock.
N Earth the unit correctly.
Do not connect the earth to a gas pipe, water pipe, lightning
rod, or telephone earth. Defective earthing could cause electric
shock.
N Do not damage the wires by applying excessive pressure
with parts or screws.
Damaged wires could cause fire or electric shock.
N Be sure to cut off the main power in case of setting up the
indoor P.C. board or wiring works.
Failure to do so could cause electric shock.
N Use the specified wires to connect the indoor and outdoor
units securely and attach the wires firmly to the terminal
block connecting sections so the stress of the wires is
not applied to the sections. Do not extend the wires, or
use intermediate connection.
Incomplete connecting and securing could cause fire.
N Do not install the unit in a place where inflammable gas
may leak.
If gas leaks and accumulates in the area around the unit, it
could cause an explosion.
N Do not use intermediate connection of the power cord or
the extension cord and do not connect many devices to
one AC outlet.
It could cause a fire or an electric shock due to defective con-
tact, defective insulation, exceeding the permissible current,
etc.
N Be sure to use the parts provided or specified parts for
the installation work.
The use of defective parts could cause an injury or leakage
of water due to a fire, an electric shock, the unit falling, etc.
N When plugging the power supply plug into the outlet,
make sure that there is no dust, clogging, or loose parts
in both the outlet and the plug. Make sure that the power
supply plug is pushed completely into the outlet.
If there is dust, clogging, or loose parts on the power supply
plug or the outlet, it could cause electric shock or fire. If loose
parts are found on the power supply plug, replace it.
N Attach the electrical cover to the indoor unit and the
service panel to the outdoor unit securely.
If the electrical cover of the indoor unit and/or the service panel
of the outdoor unit are not attached securely, it could result in
a fire or an electric shock due to dust, water, etc.
N When installing, relocating, or servicing the unit, make
sure that no substance other than the specified refrigerant
(R410A) enters the refrigerant circuit.
Any presence of foreign substance such as air can cause
abnormal pressure rise and may result in explosion or injury.
The use of any refrigerant other than that specified for the
system will cause mechanical failure, system malfunction, or
unit breakdown. In the worst case, this could lead to a serious
impediment to securing product safety.
N Do not discharge the refrigerant into the atmosphere. If
refrigerant leaks during installation, ventilate the room.
If refrigerant comes in contact with a fire, harmful gas could
be generated. Refrigerant leakage may cause suffocation.
Provide ventilation in accordance with EN378-1.
N Check that the refrigerant gas does not leak after instal-
lation has been completed.
If refrigerant gas leaks indoors, and comes into contact with
the flame of a fan heater, space heater, stove, etc., harmful
substances will be generated.
N Use appropriate tools and piping materials for installa-
tion.
The pressure of R410A is 1.6 times more than R22. Not using
appropriate tools or materials and incomplete installation could
cause the pipes to burst or injury.
N When pumping down the refrigerant, stop the compressor
before disconnecting the refrigerant pipes.
If the refrigerant pipes are disconnected while the compressor
is running and the stop valve is open, air could be drawn in
and the pressure in the refrigeration cycle could become abnormally high. This could cause the pipes to burst or injury.
N When installing the unit, securely connect the refrigerant
pipes before starting the compressor.
If the compressor is started before the refrigerant pipes are
connected and when the stop valve is open, air could be
drawn in and the pressure in the refrigeration cycle could
become abnormally high. This could cause the pipes to burst
or injury.
N Fasten a flare nut with a torque wrench as specified in
this manual.
If fastened too tight, a flare nut may break after a long period
and cause refrigerant leakage.
N The unit shall be installed in accordance with national
wiring regulations.
N Install an earth leakage breaker depending on the instal-
lation place.
If an earth leakage breaker is not installed, it could cause
electric shock.
N Perform the drainage/piping work securely according to
the installation manual.
If there is defect in the drainage/piping work, water could drop
from the unit, soaking and damaging household goods.
N Do not touch the air inlet or the aluminum fins of the
outdoor unit.
This could cause injury.
N Do not install the outdoor unit where small animals may
live.
If small animals enter and touch the electric parts inside the
unit, it could cause a malfunction, smoke emission, or fire.
Also, advise user to keep the area around the unit clean.
1-2. SELECTING THE INSTALLATION LOCATION
INDOOR UNIT
• Where airflow is not blocked.
• Where cool air spreads over the entire room.
• Rigid wall without vibration.
• Where it is not exposed to direct sunshine. Do not expose to
direct sunshine also during the period following unpacking to
before use.
• Where easily drained.
• At a distance 1 m or more away from your TV and radio. Operation of the air conditioner may interfere with radio or TV reception. An amplifier may be required for the affected device.
• In a place as far away as possible from fluorescent and incandescent lights (so the infrared remote control can operate the
air conditioner normally).
• Where the air filter can be removed and replaced easily.
REMOTE CONTROLLER
• Where it is easy to operate and easily visible.
• Where children cannot touch it.
• Select a position about 1.2 m above the floor and check that
signals from the remote controller are surely received by the
indoor unit from that position (‘beep’ or ‘beep beep’ receiving
tone sounds). After that, attach remote controller holder to a
pillar or wall and install wireless remote controller.
Note:
In rooms where inverter type fluorescent lamps are used, the signal
from the wireless remote controller may not be received.
OUTDOOR UNIT
• Where it is not exposed to strong wind.
• Where airflow is good and dustless.
• Where rain or direct sunlight can be avoided as much as possible.
• Where neighbours are not annoyed by operation sound or hot
air.
• Where rigid wall or support is available to prevent the increase
of operation sound or vibration.
• Where there is no risk of combustible gas leakage.
• When installing the unit at a high level, be sure to secure the
unit legs.
• Where it is at least 3 m away from the antenna of TV set or
radio. Operation of the air conditioner may interfere with radio
or TV reception in areas where reception is weak. An amplifier
may be required for the affected device.
• Install the unit horizontally.
• Please install it in an area not affected by snowfall or blowing
snow. In areas with heavy snow, please install a canopy, a
pedestal and/or some baffle boards.
Note:
It is advisable to make a piping loop near outdoor unit so as to
reduce vibration transmitted from there.
Note:
When operating the air conditioner in low outside temperature,
be sure to follow the instructions described below.
• Never install the outdoor unit in a place where its air inlet/
outlet side may be exposed directly to wind.
• To prevent exposure to wind, install the outdoor unit with its
air inlet side facing the wall.
• To prevent exposure to wind, it is recommended to install a
baffle board on the air outlet side of the outdoor unit.
Avoid the following places for installation where air conditioner
trouble is liable to occur.
• Where flammable gas could leak.
• Where there is much machine oil.
• Where oil is splashed or where the area is filled with oily
smoke (such as cooking areas and factories, in which the
properties of plastic could be changed and damaged).
• Salty places such as the seaside.
• Where sulfide gas is generated such as a hot spring.
• Where there is high-frequency or wireless equipment.
• Where there is emission of high levels of VOCs, including
phthalate compounds, formaldehyde, etc., which may cause
chemical cracking.
*1 Connect to the power switch which has a gap of 3 mm or more
when open to interrupt the source power phase. (When the
power switch is shut off, it must interrupt all phases.)
*2 Use wires in conformity with design 60245 IEC 57.
*3 Never use pipes with thickness less than specified. The pres-
sure resistance will be insufficient.
*4 Use a copper pipe or a copper-alloy seamless pipe.
*5 Be careful not to crush or bend the pipe during pipe bending.
*6 Refrigerant pipe bending radius must be 100 mm or more.
*7 If pipe length exceeds 7.5 m, additional refrigerant (R410A)
charge is required. (No additional charge is required for pipe
length less than 7.5 m.)
Additional refrigerant = A × (pipe length (m) – 7.5)
*8 Insulation material : Heat resisting foam plastic 0.045 specific
gravity
*9 Be sure to use the insulation of specified thickness. Excessive
thickness may cause incorrect installation of the indoor unit and
insufficient thickness may cause dew drippage.
Required Tools for Installation
Phillips screwdriver
Level
Scale
Utility knife or scissors
65 mm hole saw
Torque wrench
Wrench (or spanner)
4 mm hexagonal wrench
Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
JG79A476H01
SPLIT-TYPE AIR CONDITIONERS
INSTALLATION MANUAL
ENGLISH
English is
original.
Model names are indicated in 1-3.
Page 2
(B)
(I)
(K)
(G)
(E)
(C)
(7)
(3)
(4)
(6)
(5)
(D)
(F)
(2)
(1)
(A)
110 mm
or more
100 mm
or more
100 mm
or more
350 mm
or more
100 mm
or more
200 mm
or more
Open two sides of left,
right, or rear side.
1-4. INSTALLATION DIAGRAM
2-1. FIXING OF INSTALLATION PLATE
• Find a structural material (such as a stud) in the wall and fix installation plate (1) horizontally by tightening the fixing screws (2) firmly.
• To prevent installation plate (1) from vibrating, be sure to install the fixing screws in the
holes indicated in the illustration. For added support, fixing screws may also be installed
in other holes.
• When bolts recessed in the concrete wall are to be utilized, secure installation plate (1)
using 11 × 20 · 11 × 26 oval hole (450 mm pitch).
• If the recessed bolt is too long, change it for a shorter one available in the market.
2-2. WALL HOLE DRILLING
1) Determine the wall hole position.
2) Drill a ø65 mm hole. The outdoor side should be 5 to 7
mm lower than the indoor side.
3) Insert wall hole sleeve (C).
2-3. CONNECTING WIRES FOR INDOOR UNIT
You can connect indoor/outdoor lead wire without removing the front panel.
1) Open the front panel.
2) Remove VA clamp.
3) Pass indoor/outdoor unit connecting wire (A) from the back of the indoor unit and process
the end of the wire.
4) Loosen terminal screw, and connect first the earth wire, then indoor/outdoor unit connecting wire (A) to the terminal block. Be careful not to make mis-wiring. Fix the wire to
the terminal block securely so that no part of its core is appeared, and no external force
is conveyed to the connecting section of the terminal block.
5) Firmly tighten the terminal screws to prevent them from loosening. After tightening, pull
the wires lightly to confirm that they do not move.
6) Secure indoor/outdoor unit connecting wire (A) and the earth wire with the VA clamp.
Never fail to hook the left claw of the VA clamp. Attach the VA clamp securely.
ACCESSORIES
Check the following parts before installation.
<Indoor unit>
(1) Installation plate 1
(2)
Installation plate fixing screw
4 × 25 mm
5
(3) Remote controller holder 1
(4)
Fixing screw for (3)
3.5 × 16 mm (Black)
2
(5) Battery (AAA) for (6) 2
(6) Wireless remote controller 1
(7)
Felt tape
(For left or left-rear piping)
1
PARTS TO BE PROVIDED
AT YOUR SITE
(A) Indoor/outdoor unit connecting wire* 1
(B) Extension pipe 1
(C) Wall hole sleeve 1
(D) Wall hole cover 1
(E) Pipe fixing band 2 to 5
(F) Fixing screw for (E) 4 × 20 mm 2 to 5
(G) Piping tape 1
(H) Putty 1
(I)
Drain hose
(or soft PVC hose, 15 mm inner
dia. or hard PVC pipe VP16)
1
(J) Refrigeration oil 1
(K) Power supply cord* 1
Units should be installed by licensed contractor
according to local code requirements.
Liquid pipe
Gas pipe
Felt tape (7)
Indoor/outdoor unit
connecting wire (A)
Piping tape (G)
Indoor unit
Wall hole
sleeve (C)
Cut off the
extra length.
Pipe fixing band
(E)
Be sure to use wall hole
sleeve (C) to prevent indoor/outdoor connecting
wire (A) from contacting
metal parts in the wall
and to prevent damage by
rodents in case the wall
is hollow.
Wall hole cover (D)
Seal the wall hole
gap with putty (H).
Fix the pipe to wall
with pipe fixing
band (E).
Fixing screw (F)
After the leak test, apply
insulating material tightly so
that there is no gap.
When the piping is to be
attached to a wall containing
metals (tin plated) or metal
netting, use a chemically
treated wooden piece 20 mm
or thicker between the wall
and the piping or wrap 7 to 8
turns of insulation vinyl tape
around the piping.
To use existing piping, perform COOL operation for
30 minutes and pump down
before removing the old air
conditioner. Remake flare
according to the dimension
for new refrigerant.
2. INDOOR UNIT INSTALLATION
2-4. PIPE FORMING AND DRAIN PIPING
Pipe Forming
• Place the drain hose below the refrigerant piping.
• Make sure that the drain hose is not heaved or snaked.
• Do not pull the hose when applying the tape.
• When the drain hose passes the room, be sure to wrap
insulation material (obtainable at a store) around it.
* Note:
Place indoor/outdoor unit connecting wire (A) and
power supply cord (K) at least 1 m away from the
TV antenna wire.
Appearance of the outdoor unit may differ from some models.
100 mm
or more
Air inlet
Air outlet
Outdoor unit installation
4-10 mm × 16 mm slot
718 mm
70 mm
500 mm
300 mm
255 mm
264-280 mm
40 mm
12 mm
or more
54 mm or
more/ 130 mm
or more for left and
left back piping
(using spacer)
Wall
Outdoor
side
5-7 mm
ø65 mm
Installation plate (1)
Plumb
Align the plumb
line with the
mark
.
Center of
ø65 mm hole
110 mm
or more
100 mm
or more
Bind the line to the center hole.
54 mm or more
130 mm or more for left and left
back piping (using spacer)
Ceiling
Wall Wall
Fixing screw (2)
* Same for left hole.
Insert
the
scale. *
Align the
scale with
the line. *
100 mm
Level
Terminal block
Fixing screw
Indoor/outdoor unit
connecting wire (A)
VA clamp
Lead wire
15 mm
35 mm
• For future servicing, give extra length to
the connecting wires.
• Make earth wire a little longer than others.
(More than 60 mm)
• Do not fold the excess wire, or cram it into
small space. Take caution not to damage
the wires.
• Be sure to attach each screw to its correspondent terminal when securing the cord
and/or the wire to the terminal block.
Note: Do not place the wires between the
indoor unit and the installation plate (1).
Damaged wire could cause heat generation or fire.
Indoor terminal block
Indoor/outdoor
unit connecting
wire (A)
Outdoor terminal block
Earth wire
(green/yellow)
2NL
2NL
Page 3
Left or left-rear piping
Note:
Be sure to reattach the drain
hose and the drain cap in case
of left or left-rear piping.
Otherwise, it could cause drops
of water to drip down from the
drain hose.
1) Put the refrigerant piping and the drain hose together,
then firmly apply felt tape (7) from the end.
Felt tape (7) overlap width should be 1/3 the tape width.
Use a bandage stopper at the end of felt tape (7).
2) Pull out the drain cap at the rear right of the indoor unit.
(Fig. 1)
• Hold the convex section at the end and pull the drain
cap.
3) Pull out the drain hose at the rear left of the indoor unit.
(Fig. 2)
• Hold the claw marked by the arrows and pull out the
drain hose forward.
4) Put the drain cap into the section to which the drain
hose is to be attached at the rear of the indoor unit.
(Fig. 3)
• Insert not sharp-edged tools such as screwdrivers into
the hole at the end of the cap and insert the cap fully
into the drain pan.
5) Insert the drain hose fully into the drain pan at the rear
right of the indoor unit. (Fig. 4)
• Check if the hose is hooked securely to the projection
of its inserting part at the drain pan.
6) Insert the drain hose into wall hole sleeve (C), and hook
the upper part of indoor unit on installation plate (1). Then,
move the indoor unit completely to the left in order to make
placing the piping in the back space of the unit easier.
7) Cut out a piece of cardboard from the shipping box, roll
it up, hook it onto the back rib, and use it as a spacer to
lift the indoor unit. (Fig. 5)
8) Connect the refrigerant piping with the extension pipe
(B).
9) Thrust the lower part of the indoor unit into the installation
plate (1).
3-2. FLARING WORK
1) Cut the copper pipe correctly with pipe cutter.
(Fig. 1, 2)
2) Completely remove all burrs from the cut cross section
of pipe. (Fig. 3)
• Put the end of the copper pipe to downward direction
as you remove burrs in order to avoid to let burrs
drop in the piping.
3) Remove flare nuts attached to indoor and outdoor
units, then put them on pipe having completed burr
removal. (Not possible to put them on after flaring
work.)
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the
dimension shown in the table. Select A mm from the
table according to the tool you use.
5) Check
• Compare the flared work with Fig. 6.
• If flare is noted to be defective, cut off the flared sec
-
tion and do flaring work again.
3-3. PIPE CONNECTION
• Fasten flare nut with a torque wrench as specified in the table.
• When fastened too tight, flare nut may break after a long period and cause refrigerant leak
-
age.
• Be sure to wrap insulation around the piping. Direct contact with the bare piping may result
in burns or frostbite.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
• Apply a thin coat of refrigeration oil (J) on the seat surface of pipe.
• For connection, first align the center, then tighten the first 3 to 4 turns of flare nut.
• Use tightening torque table above as a guideline for indoor unit side union joint section, and
tighten using two wrenches. Excessive tightening damages the flare section.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in the
same manner applied for indoor unit.
• For tightening, use a torque wrench or spanner and use the
same tightening torque applied for indoor unit.
3-4. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, surely insulate every piping including valves.
3) Using piping tape (G), apply taping starting from the entry of outdoor unit.
• Stop the end of piping tape (G) with tape (with adhesive agent attached).
• When piping have to be arranged through above ceiling, closet or where the temperature
and humidity are high, wind additional commercially sold insulation to prevent condensation.
Rear, right, or downward piping
1) Put the refrigerant piping and the drain hose
together, then firmly apply piping tape (G) from
the end.
2) Insert the piping and the drain hose into the wall
hole sleeve (C), and hook the upper part of the
indoor unit on the installation plate (1).
3) Check if the indoor unit is hooked securely on the installation plate (1) by moving
the unit to left and right.
4) Thrust the lower part of the indoor unit into the installation plate (1).
Drain Piping
• If the extension drain hose has to pass through a room, be sure to wrap it with commercially sold insulation.
• The drain hose should point downward for easy drain flow. (Fig. 1)
• If the drain hose provided with the indoor unit is too short, connect it with drain hose
(I) that should be provided at your site. (Fig. 2)
• When connecting the drain hose to the hard vinyl chloride pipe, be sure to insert it
securely into the pipe. (Fig. 3)
Do not make drain piping as shown below.
Do not raise
Accumulated
drain water
Air
Waving
Water
leakage
Water
leakage
Water
leakage
Tip of drain
hose dipped
in water
Ditch
At least
50 mm
gap
Cut off in case of
right piping.
Cut off in case of downward piping.
Copper
pipe
Good
90°
Tilted Uneven Burred
No good
Fig. 1
Fig. 2
Burr
Copper pipe
Spare reamer
Pipe cutter
Clutch type
Flaring tool
Fig. 4Fig. 3
Downward
slope
Drain
hose
Soft hose
I.D. 15 mm
Drain hose
Hard vinyl chloride
pipe I.D. 30 mm
Insert
securely
Different
diameter
joint
70 cm or
more
Fig. 1 Fig. 2 Fig. 3
Drain cap
Drain cap
Drain hose
Cut off in case of left
piping.
Drain cap
Piping tape (G)
Drain hose
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Felt tape (7)
3. OUTDOOR UNIT INSTALLATION
Smooth all
around
Even length
all around
Inside is shining without any
scratches.
A
Flare nut
Die
Fig. 5
Fig. 6
Copper pipe
Wing nut type
3-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Open the service panel.
2) Loosen terminal screw, and connect indoor/outdoor unit connecting wire (A) from
the indoor unit correctly on the terminal block. Be careful not to make mis-wiring. Fix
the wire to the terminal block securely so that no part of its core is appeared, and no
external force is conveyed to the connecting section of the terminal block.
3) Firmly tighten the terminal screws to prevent them from loosening. After tightening,
pull the wires lightly to confirm that they do not move.
4) Connect power supply cord (K).
5)
Fix indoor/outdoor unit connecting wire (A) and power supply cord (K) with the cord clamp.
6) Close the service panel securely.
Terminal block
Cord clamp
L
N
Power supply cord (K)
Indoor/outdoor unit
connecting wire (A)
• Make earth wire a little longer than
others. (More than 100 mm)
• For future servicing, give extra
length to the connecting wires.
• Be sure to attach each screw to
its correspondent terminal when
securing the cord and/or the wire
to the terminal block.
15 mm
35 mm
Lead wire
Pipe diameter
(mm)
Nut
(mm)
A (mm) Tightening torque
Clutch type
tool
for R410A
Clutch type
tool
for R22
Wing nut
type tool
for R22
N•m kgf•cm
ø6.35 (1/4”) 17
0 to 0.5 1.0 to 1.5
1.5 to 2.0
13.7 to 17.7 140 to 180
ø9.52 (3/8”) 22 34.3 to 41.2 350 to 420
ø12.7 (1/2”) 26
2.0 to 2.5
49.0 to 56.4 500 to 575
ø15.88 (5/8”) 29 73.5 to 78.4 750 to 800
WARNING
When installing the unit, securely connect the refrigerant
pipes before starting the compressor.
Page 4
4-1. PURGING PROCEDURES AND LEAK TEST
1) Remove service port cap of stop valve on the side of the outdoor unit gas pipe. (The stop
valves are fully closed and covered in caps in initial state.)
2) Connect gauge manifold valve and vacuum pump to service port of stop valve on the
gas pipe side of the outdoor unit.
4-2. TEST RUN
1) Insert power supply plug into the power outlet and/or turn on the
breaker.
2) Press the E.O. SW. Test run will be performed for 30 minutes.
If the upper lamp of the operation indicator blinks every 0.5
seconds, inspect the indoor/outdoor unit connecting wire (A) for
mis-wiring. After the test run, emergency COOL mode (24°C
COOL) will start.
3) To stop operation, press the E.O. SW several times until all LED
lamps turn off. Refer to operating instructions for details.
Checking the remote (infrared) signal reception
Press the ON/OFF button on the remote controller and check that an electronic sound is
heard from the indoor unit. Press the ON/OFF button again to turn the air conditioner off.
• Once the compressor stops, the restart preventive device operates so the compressor
will not operate for 3 minutes to protect the air conditioner.
4-3. AUTO RESTART FUNCTION
This product is equipped with an auto restart function. When the power supply is stopped
during operation, such as during blackouts, the function automatically starts operation in
the previous setting once the power supply is resumed. (Refer to the operating instructions
for details.)
4-4. EXPLANATION TO THE USER
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (how to use the remote controller, how to remove the air filters, how to remove or
put the remote controller in the remote controller holder, how to clean, precautions for
operation, etc.).
• Recommend the user to read the OPERATING INSTRUCTIONS carefully.
5-3. PUMPING DOWN
When relocating or disposing of the air conditioner, pump down the system following the
procedure below so that no refrigerant is released into the atmosphere.
1) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe
side of the outdoor unit.
2) Fully close the stop valve on the liquid pipe side of the outdoor unit.
3) Close the stop valve on the gas pipe side of the outdoor unit almost completely so that it
can be easily closed fully when the pressure gauge shows 0 MPa [Gauge] (0 kgf/cm
2
).
4) Start the emergency COOL operation.
To start the emergency operation in COOL mode, disconnect the power supply plug
and/or turn off the breaker. After 15 seconds, connect the power supply plug and/or turn
on the breaker, and then press the E.O. SW once. (The emergency COOL operation can
be performed continuously for up to 30 minutes.)
5) Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure
gauge shows 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm
2
).
6) Stop the emergency COOL operation.
Press the E.O. SW several times until all LED lamps turn off. Refer to operating instruc-
tions for details.
3) Run the vacuum pump. (Vacuumize for more than 15 minutes.)
4) Check the vacuum with gauge manifold valve, then close gauge manifold valve, and stop
the vacuum pump.
5) Leave as it is for one or two minutes. Make sure pointer gauge manifold valve remains
in the same position. Confirm that pressure gauge shows –0.101 MPa [Gauge] (–760
mmHg).
6) Remove gauge manifold valve quickly from service port of stop valve.
7) After refrigerant pipes are connected and evacuated, fully open all stop valves on both
sides of gas pipe and liquid pipe. Operating without fully opening lowers the performance
and this causes trouble.
Caution:
• After test run or remote signal reception check, turn off the unit with the E.O. SW or
the remote controller before turning off the power supply. Not doing so will cause the
unit to start operation automatically when power supply is resumed.
To the user
• After installing the unit, make sure to explain the user about auto restart function.
• If auto restart function is unnecessary, it can be deactivated. Consult the service
representative to deactivate the function. Refer to the service manual for details.
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
5. RELOCATION AND MAINTENANCE
8) Refer to 1-3., and charge the prescribed amount of refrigerant if needed. Be sure to charge
slowly with liquid refrigerant. Otherwise, composition of the refrigerant in the system may
be changed and affect performance of the air conditioner.
9) Tighten cap of service port to obtain the initial status.
10) Leak test
5-1.
REMOVING AND INSTALLING THE PANEL ASSEMBLY
5-2. REMOVING THE INDOOR UNIT
Remove the bottom of the indoor unit from the installation
plate.
When releasing the corner part, release both left and right
bottom corner part of indoor unit and pull it downward and
forward as shown in the figure on the right.
If the above method cannot be used
Remove the panel. Then, insert hexagonal wrenches into the square holes on the left and
right sides of the unit and push them up as shown in the following figure. The bottom of the
indoor unit lowers and releases the hooks.
Removal procedure
1) Remove the 2 screws which fix the panel assem
-
bly.
2) Remove the panel assembly. Be sure to remove its
bottom end first.
Installation procedure
1) Install the panel assembly following the removal
procedure in reverse.
2) Be sure to press the positions as indicated by the
arrows in order to attach the assembly completely
to the unit.
Push
Lower
Square hole
Emergency
operation
switch
(E.O. SW)
When pumping down the refrigerant, stop the compressor before disconnecting
the refrigerant pipes. The compressor may burst if air etc. get into it.
WARNING
Stop valve for
GAS
Stop valve cap
(Torque 19.6 to
29.4 N•m, 200
to 300 kgf•cm)
Vacuum pump (or the vacuum
pump with the function to
prevent the back flow)
Compound pressure gauge
(for R410A)
–0.101 MPa
(
–760 mmHg)
Handle
Low
Charge hose
(for R410A)
*Close
*Open
Hexagonal wrench
Precautions when using the control valve
When attaching the control valve to
the service port, valve core may deform or loosen if excess pressure is
applied. This may cause gas leak.
Service port
Body
Close
Open
Control valve
A
When attaching the control valve to
the service port, make sure that the
valve core is in closed position, and
then tighten part A. Do not tighten
part A or turn the body when valve
core is in open position.
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
*4 to 5 turns
Stop valve
for LIQUID
Pressure gauge
(for R410A)
Charge hose
Gauge manifold valve
(for R410A)
Handle High
Adapter for
preventing the
back flow
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO
100-8310, JAPAN
AUTHORIZED REPRESENTATIVE IN EU:
MITSUBISHI ELECTRIC EUROPE B.V.
HARMAN HOUSE, 1 GEORGE STREET, UXBRIDGE, MIDDLESEX UB8 1QQ, U.K.
This product is designed and intended for use in the residential, commercial and
light-industrial environment.
The product at hand is
based on the following
EU regulations:
• Low Voltage Directive 2006/95/EC
• Machinery Directive 2006/42/EC
• Electromagnetic Compatibility Directive 2004/108/EC
Note:
Complete pumping down within 3 minutes. After 3 minutes, the unit will automatically
stop to prevent a burst in case that air is mixed up.
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